网络图片加载

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.drawable.BitmapDrawable;
import android.graphics.drawable.ColorDrawable;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.TransitionDrawable;
import android.widget.ImageView;

import com.lidroid.xutils.BitmapUtils;
import com.lidroid.xutils.bitmap.BitmapDisplayConfig;
import com.lidroid.xutils.bitmap.callback.BitmapLoadFrom;
import com.lidroid.xutils.bitmap.callback.DefaultBitmapLoadCallBack;
import com.yc.jpyy.R;

/**
 * @类名 网络图片加载
 */
public class xUtilsImageLoader {// 框架里面设置了缓存和异步操作，不用单独设置线程池和缓存机制（也可以自定义缓存路径）

	private BitmapUtils bitmapUtils;
	private Context mContext;

	public xUtilsImageLoader(Context context) {
		// TODO Auto-generated constructor stub
		this.mContext = context;
		bitmapUtils = new BitmapUtils(mContext);
		bitmapUtils.configDefaultLoadingImage(R.drawable.tx);// 默认背景图片
		bitmapUtils.configDefaultLoadFailedImage(R.drawable.tx);// 加载失败图片
		bitmapUtils.configDefaultBitmapConfig(Bitmap.Config.ARGB_8888);// 设置图片压缩类型
	}

	/**
	 * @category 图片回调函数
	 */
	public class CustomBitmapLoadCallBack extends
			DefaultBitmapLoadCallBack<ImageView> {

		@Override
		public void onLoading(ImageView container, String uri,
				BitmapDisplayConfig config, long total, long current) {
		}

		@Override
		public void onLoadCompleted(ImageView container, String uri,
				Bitmap bitmap, BitmapDisplayConfig config, BitmapLoadFrom from) {
			// super.onLoadCompleted(container, uri, bitmap, config, from);
			fadeInDisplay(container, bitmap);
		}

		@Override
		public void onLoadFailed(ImageView container, String uri,
				Drawable drawable) {
			// TODO Auto-generated method stub
		}
	}

	private static final ColorDrawable TRANSPARENT_DRAWABLE = new ColorDrawable(
			android.R.color.transparent);

	/**
	 * @category 图片加载效果
	 * @param imageView
	 * @param bitmap
	 */
	private void fadeInDisplay(ImageView imageView, Bitmap bitmap) {// 目前流行的渐变效果
		final TransitionDrawable transitionDrawable = new TransitionDrawable(
				new Drawable[] { TRANSPARENT_DRAWABLE,
						new BitmapDrawable(imageView.getResources(), bitmap) });
		imageView.setImageDrawable(transitionDrawable);
		transitionDrawable.startTransition(500);
	}

	public void display(ImageView container, String url) {// 外部接口函数
		bitmapUtils.display(container, url);
	}
}